摘要
铝电解槽内保持良好的热平衡可以减少铝电解过程中的能耗,而氧化铝周期性的下料会破坏电解槽热平衡。建立铝电解槽电解质浓度-热场瞬态模型,在精确模拟氧化铝浓度分布的基础上,研究下料期间电解质温度及热平衡的变化趋势。结果表明:氧化铝下料时,电解质极距层局部温度降低5℃左右,上表面附近区域最多降低十几度;下料结束20 s内,逐渐恢复到正常温度;氧化铝下料会打破电解质内的热平衡,其中部分热量(最高达300 k W)用来加热氧化铝颗粒;20 s后,电解质会达到新的热平衡状态。
Keeping good heat balance in the aluminum reduction cell can decrease the energy consumption in the process of aluminum electrolysis, but the feeding can destroy the heat balance. The transient model of alumina concentration and thermal field in cell was established. Based on the accurate simulation of the alumina concentration distribution, the temperature and heat balance were studied. The results show that the local electrolyte temperature decrease about 5 ℃ in the electrolyte space layer and the dozen degrees around the bath surface, and gradually restored to the original temperature after 20 s. The feeding can break the heat balance of the cell, and heat at 300 kW is used to heat the alumina particles. After 20 s, the cell reaches a new heat balance state.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2016年第2期430-438,共9页
The Chinese Journal of Nonferrous Metals
基金
国家国际科技合作专项项目(2013DFB70220)~~
关键词
铝电解槽
氧化铝浓度分布
浓度
热场
热平衡
aluminum reduction cell
alumina concentration distribution
concentration
thermal field
heat balance
